CN105846732A - Control circuit - Google Patents
Control circuit Download PDFInfo
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- CN105846732A CN105846732A CN201610363623.4A CN201610363623A CN105846732A CN 105846732 A CN105846732 A CN 105846732A CN 201610363623 A CN201610363623 A CN 201610363623A CN 105846732 A CN105846732 A CN 105846732A
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- signal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a control circuit which is connected to an H bridge output driving circuit of a brushless direct current motor. The control circuit comprises a processing unit and a signal unit, wherein the processing unit is respectively connected to a signal unit and the H bridge output driving circuit for controlling an effective value or a current direction of the current entering the brushless direct current motor; the signal unit comprises a hall element, a hall amplifier, a selector and an analog-digital converter; the processing unit comprises an input signal detection module, a hysteresis comparator, a hall signal detection module and an output module; and the output module is connected to the H bridge output driving circuit. The control circuit has the following advantages and beneficial effects that the system circuit is simplified, the circuit area is reduced, the design and debugging difficulty of the control circuit and the power consumption for boot or commutation of the brushless direct current motor are reduced, and the reliability and the durability of the control circuit and the working efficiency of the brushless direct current motor are improved; and the damage to the brushless direct current motor due to overlarge current or excessively fast current commutation is avoided.
Description
Technical field
The present invention relates to control field, particularly to a kind of control circuit.
Background technology
Brushless DC motor control circuit, is the D/A converter module output controlled by digital module and Hall plate output letter
Number relatively determine positive-negative polarity through analog circuit, produce hall signal by hysteresis comparator analog circuit, and pass through
Hysteresis comparator thresholding needs to adjust hall signal according to different application, it is achieved the control to brshless DC motor, therefore, existing
The design of some brushless DC motor control circuits is complex with debugging, and reliability and ruggedness are poor；The most existing nothing
The Starting mode of brushless motor and switching mode mostly are and directly initiate and directly switch, wherein, and the startup electricity directly initiated
Stream is 3-7 times of Rated motor electric current, and therefore brshless DC motor is when directly initiating or directly switch, and often to consume excessive
Power, thus cause the inefficiency of motor and cause energy waste；Starting current owing to directly initiating is motor again
3-7 times of rated current, therefore brshless DC motor is usually associated with owing to electric current is excessive or sense of current sudden change on startup,
And cause the risk that brshless DC motor damages.
Summary of the invention
In order to solve the problems referred to above, the present invention provides a kind of control circuit.The technical program achieves techniques below effect:
1) by accessing selector while minimum speed is set end and Hall amplifier, and by utilizing numeral sluggish
Comparator, it is achieved analog-digital converter is carried out multiplexing, self-adaptative adjustment hysteretic threshold, thus simplified system circuit, decreases electricity
Road surface is amassed, and reduces design and the debugging difficulty of control circuit, improves reliability and the ruggedness of control circuit；
2) by utilizing soft-start module and soft switching module, improve the work efficiency of brshless DC motor, the energy drops
Low brshless DC motor, in the power consumption started or during commutation, saves the energy；Also avoid when starting or commutate simultaneously, by
Or electric current excessive in electric current commutates too fast and damages the situation of brshless DC motor.
A kind of control circuit in the present invention, is connected with the H bridge output driving circuit of brshless DC motor, is used for controlling institute
Stating rotating speed or the torque of brshless DC motor, described control circuit includes processing unit and signal element, described processing unit with
Described signal element connects, and described processing unit is also connected with described H bridge output driving circuit, is used for controlling entering described brushless
The virtual value of electric current or the sense of current in direct current generator；
Described signal element includes Hall element, Hall amplifier, selector and analog-digital converter, described processing unit bag
Include input signal detection module, hysteresis comparator, hall signal detection module and output module；Described Hall element is used for exporting
Hall signal, described Hall element is connected with the input of described Hall amplifier, the outfan of described Hall amplifier and institute
The input stating selector connects, and the outfan of described selector is connected with the input of described analog-digital converter, described modulus
The outfan of transducer is connected with the input of described input signal detection module, the outfan of described input signal detection module
Being connected with the input of described hysteresis comparator, the outfan of described hysteresis comparator is defeated with described hall signal detection module
Enter end to connect；Described output module is connected with described H bridge output driving circuit；
Described hall signal forms Hall digital signal, described Hall digital through described Hall amplifier and analog-digital converter
Signal enters described hysteresis comparator through described input signal detection module, and described hysteresis comparator is believed according to described Hall digital
Number to described hall signal detection module output positive voltage or negative voltage.
In such scheme, described signal element includes that pulse-width signal end, minimum speed set end and buffer；Described
Pulse-width signal end is used for receiving pulse-width signal, and described minimum speed sets end and is used for receiving minimum speed setting letter
Number；Described buffer is connected with described pulse-width signal end, is used for receiving described pulse-width signal and being sent to described place
Reason unit；Described minimum speed sets end and is connected with described selector input, and described minimum speed sets signal through described choosing
Select device and enter described analog-digital converter, described minimum speed setting signal is converted into minimum speed digital signal, described modulus
Described minimum speed digital signal is sent to described input signal detection module by transducer.
In such scheme, described processing unit also includes pulsewidth modulation detection module and soft-start module, and described pulsewidth is adjusted
Detection module processed is connected with described buffer, is used for receiving described pulse-width signal；Described soft-start module is respectively with described
Input signal detection module and connection, be used for receiving described pulse-width signal and minimum speed digital signal, and to described arteries and veins
Wide modulated signal and minimum speed digital signal are compared, and select in described pulse-width signal and minimum speed digital signal
The bigger signal of dutycycle is as target duty ratio；Described soft-start module exports with described H bridge also by described output module
Drive circuit connects, with the virtual value of electric current in the control described brshless DC motor of entrance.
In such scheme, described soft-start module steps up the dutycycle of described pulse-width signal, until described arteries and veins
The dutycycle of wide modulated signal is consistent with described target duty ratio；Described output module controls institute according to described pulse-width signal
State the time being switched on or off of each metal-oxide-semiconductor in H bridge output driving circuit, to control to enter electric current in described brshless DC motor
Virtual value.
In such scheme, state processing unit and also include that dutyfactor value module, described output module are set with rotating speed of target also
It is connected with described input signal detection module；The result of calculation of the dutycycle of pulse-width signal is led to by described dutyfactor value module
Cross described soft-start module and deliver to described output module；Described output module is according to the calculating of described pulse-width signal dutycycle
Result obtains the rotating speed of target of described motor, and described output module is always according to the reality of motor described in described Hall digital signal acquisition
Time rotating speed, and described rotating speed of target is compared with described real-time rotating speed；
When described rotating speed of target is more than described real-time rotating speed, described output module is by improving described pulse-width signal
Dutycycle, improve and enter the virtual value of electric current in described brshless DC motor, to improve the real-time of described brshless DC motor
Rotating speed；When described rotating speed of target is less than described real-time rotating speed, described output module is by reducing described pulse-width signal
Dutycycle, is lowered into the virtual value of electric current in described brshless DC motor, to reduce turning in real time of described brshless DC motor
Speed.
In such scheme, described hysteresis comparator is provided with hysteresis and lower hysteresis, and described hysteresis comparator will connect
The described Hall digital signal received respectively with described upper hysteresis and lower hysteresis comparison；
When described Hall digital signal is more than described upper hysteresis, described hysteresis comparator detects to described hall signal
Module output positive voltage, when described Hall digital signal is less than described lower hysteresis, described hysteresis comparator is believed to described Hall
Number detection module output negative voltage.
In such scheme, described processing unit also includes soft switching module, described hall signal detection module respectively with institute
State soft switching module and Hall amplifier connects, in described hall signal detection module, be set with the nominal torque cycle；Described suddenly
Described positive voltage or negative voltage transition that your signal detection module receives become Hall square wave, and calculate according to described Hall square wave
The real-time torque cycle of described brshless DC motor；
When described real-time torque cycle is less than the described nominal torque cycle, described hall signal detection module trims described
Hall square wave also exports, to increase soft switching time；When described real-time torque cycle is equal to or more than the described nominal torque cycle
Time, described hall signal detection module stops trimming described Hall square wave and exporting.
In such scheme, described hall signal detection module passes sequentially through described soft switching module and output module to described
H bridge output driving circuit exports described Hall square wave, for controlling in described H bridge output driving circuit according to described Hall square wave
Being switched on or off of each metal-oxide-semiconductor, with the sense of current of electric current in the control described brshless DC motor of entrance.
In such scheme, the input of described selector includes first input end and the second input, described first input
End is connected with the outfan of described Hall amplifier, and described second input sets end with described minimum speed and is connected；Described
Minimum speed is set signal successively through described selector, described analog-to-digital conversion module, described input signal by little speed setting end
Detection module and described hysteresis comparator, be sent to described hall signal detection module.
Advantages of the present invention and having the beneficial effects that: the present invention provides a kind of control circuit, simplifies circuit system, reduces
Circuit area, reduces design and the debugging difficulty of control circuit, improves reliability and the ruggedness of control circuit；Improve
The work efficiency of brshless DC motor, the energy reduces brshless DC motor in the power consumption started or during commutation, saves energy
Source；Also avoid when starting or commutate simultaneously, damage brshless DC motor owing to electric current is excessive or electric current commutation is too fast
Situation.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural schematic block diagram of a kind of control circuit of the present invention.
In figure: 1, processing unit 2, signal element 3, brshless DC motor
11, input signal detection module 12, hysteresis comparator 13, hall signal detection module
14, pulsewidth modulation detection module 15, soft-start module 16, soft switching module
17, dutyfactor value module 18, output module
21, Hall element 22, Hall amplifier 23, selector
24, analog-digital converter 25, minimum speed set end 26, pulse-width signal end
27, buffer 31, H bridge output driving circuit
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is further described.Following example are only
For technical scheme is clearly described, and can not limit the scope of the invention with this.
As it is shown in figure 1, the present invention is a kind of control circuit, connect with the H bridge output driving circuit 31 of brshless DC motor 3
Connecing, for controlling rotating speed or the torque of brshless DC motor 3, control circuit includes processing unit 1 and signal element 2, processes single
Unit 1 is connected with signal element 2, and processing unit 1 is also connected with H bridge output driving circuit 31, is used for controlling to enter brushless dc
The virtual value of electric current or the sense of current in machine 3；
Signal element 2 includes Hall element 21, Hall amplifier 22, selector 23 and analog-digital converter 24, processing unit 1
Including input signal detection module 11, hysteresis comparator 12, hall signal detection module 13 and output module 18；Hall element 21
For exporting hall signal, Hall element 21 is connected with the input of Hall amplifier 22, the outfan of Hall amplifier 22 with
The input of selector 23 connects, and the outfan of selector 23 is connected with the input of analog-digital converter 24, analog-digital converter 24
Outfan be connected with the input of input signal detection module 11, the outfan of input signal detection module 11 compares with sluggishness
The input of device 12 connects, and the outfan of hysteresis comparator 12 is connected with the input of hall signal detection module 13；Output mould
Block 18 is connected with H bridge output driving circuit 31；
Hall signal forms Hall digital signal through Hall amplifier 22 and analog-digital converter 24, and Hall digital signal is through defeated
Entering signal detection module 11 and enter hysteresis comparator 12, hysteresis comparator 12 detects mould according to Hall digital signal to hall signal
Block 13 exports positive voltage or negative voltage.
Preferably, signal element 2 includes that pulse-width signal end 26, minimum speed set end 25 and buffer 27；Pulsewidth
Modulated signal end 26 is used for receiving pulse-width signal, and minimum speed sets end 25 and is used for receiving minimum speed setting signal；Slow
Storage 27 is connected with pulse-width signal end 26, is used for receiving pulse-width signal and being sent to processing unit 1；Minimum speed sets
Fixed end 25 is connected with selector 23 input, and minimum speed sets the chosen device of signal 23 and enters analog-digital converter 24, by minimum
Rotary speed setting signal is converted into minimum speed digital signal, and minimum speed digital signal is sent to input letter by analog-digital converter 24
Number detection module 11.
Preferably, processing unit 1 also includes pulsewidth modulation detection module 14 and soft-start module 15, pulsewidth modulation detection mould
Block 14 is connected with buffer 27, is used for receiving pulse-width signal；Soft-start module 15 respectively with input signal detection module 11
And connection, it is used for receiving pulse-width signal and minimum speed digital signal, and to pulse-width signal and minimum speed numeral
Signal is compared, and selects the signal that in pulse-width signal and minimum speed digital signal, dutycycle is bigger as target duty
Ratio；Soft-start module 15 is connected with H bridge output driving circuit 31 also by output module 18, to control to enter brshless DC motor
The virtual value of electric current in 3.
Preferably, soft-start module 15 steps up the dutycycle of pulse-width signal, until the accounting for of pulse-width signal
Empty ratio is consistent with target duty ratio；Output module 18 is according to each metal-oxide-semiconductor in pulse-width signal control H bridge output driving circuit 31
The time being switched on or off, to control to enter the virtual value of electric current in brshless DC motor 3.
Preferably, state processing unit 1 and also include that dutyfactor value module 17, output module 18 are set with rotating speed of target and with defeated
Enter signal detection module 11 to connect；The result of calculation of the dutycycle of pulse-width signal is passed through soft start by dutyfactor value module 17
Module 15 delivers to output module 18；Output module 18 obtains the target of motor according to the result of calculation of pulse-width signal dutycycle
Rotating speed, output module 18 is always according to the real-time rotating speed of Hall digital signal acquisition motor, and is entered with real-time rotating speed by rotating speed of target
Row comparison；
When rotating speed of target is more than real-time rotating speed, output module 18, by improving the dutycycle of pulse-width signal, improves
The virtual value of electric current in entrance brshless DC motor 3, to improve the real-time rotating speed of brshless DC motor 3；When rotating speed of target is less than
In real time during rotating speed, output module 18, by reducing the dutycycle of pulse-width signal, is lowered into electric current in brshless DC motor 3
Virtual value, to reduce the real-time rotating speed of brshless DC motor 3.
Preferably, hysteresis comparator 12 is provided with hysteresis and lower hysteresis, and hysteresis comparator 12 will receive suddenly
Your digital signal respectively with upper hysteresis and lower hysteresis comparison；
When Hall digital signal is more than upper hysteresis, hysteresis comparator 12 exports positive electricity to hall signal detection module 13
Pressure, when Hall digital signal is less than lower hysteresis, hysteresis comparator 12 exports negative voltage to hall signal detection module 13.
Preferably, processing unit 1 also includes soft switching module 16, hall signal detection module 13 respectively with soft switching module
16 and Hall amplifier 22 connect, be set with the nominal torque cycle in hall signal detection module 13；Hall signal detection module
13 positive voltages received or negative voltage transition become Hall square wave, and calculate the real-time of brshless DC motor 3 according to Hall square wave
Torque cycle；
When real-time torque cycle is less than the nominal torque cycle, hall signal detection module 13 trims Hall square wave defeated
Go out, to increase soft switching time；When real-time torque cycle is equal to or more than the nominal torque cycle, hall signal detection module 13
Stop trimming Hall square wave and exporting.
Preferably, hall signal detection module 13 pass sequentially through soft switching module 16 and output module 18 to H bridge output drive
Galvanic electricity road 31 exports Hall square wave, for controlling unlatching or the pass of each metal-oxide-semiconductor in H bridge output driving circuit 31 according to Hall square wave
Disconnected, with the sense of current of electric current in control entrance brshless DC motor 3.
Preferably, the input of selector 23 includes first input end and the second input, and first input end is put with Hall
The outfan of big device 22 connects, and the second input sets end 25 with minimum speed and is connected；Minimum speed sets end 25 and minimum is turned
Speed sets the most chosen device of signal 23, analog-to-digital conversion module, input signal detection module 11 and hysteresis comparator 12, is sent to
Hall signal detection module 13.
On the basis of technique scheme, brshless DC motor 3 is controlled by available following methods:
1) brshless DC motor 3 starts soft start control method
Operation soft-start module 15, soft-start module 15 is by carrying out pulse-width signal and minimum speed digital signal
Comparison, selects the bigger signal in pulse-width signal and minimum speed digital signal as target duty ratio；Soft start mould
Block 15 is connected with H bridge output driving circuit 31 also by output module 18, to control to enter having of electric current in brshless DC motor 3
Valid value；
Soft-start module 15 steps up the dutycycle of pulse-width signal, and wherein, the dutycycle of pulse-width signal exists
2ms internal linear increases to 40%, and then every 20ms increases by 1%；After electric machine rotation one encloses, then with every 20ms increasing or decreasing
1%, the dutycycle making pulse-width signal is close to target duty ratio, until the dutycycle of pulse-width signal accounts for target
Empty ratio is consistent, completes soft start-up process.
2) the electric current commutation soft handover control method of brshless DC motor 3
Hall signal detection module 13 passes sequentially through dutyfactor value module 17, soft switching module 16 and output module 18 to H
Bridge output driving circuit 31 exports Hall square wave, each metal-oxide-semiconductor in control H bridge output driving circuit 31 according to Hall square wave
It is switched on or off, with the sense of current of electric current in control entrance brshless DC motor 3；
Hysteresis comparator 12 is provided with hysteresis and lower hysteresis, the Hall digital letter that hysteresis comparator 12 will receive
Number respectively with upper hysteresis and lower hysteresis comparison, and export positive voltage or negative voltage；Hall signal detection module 13 will receive
To positive voltage or negative voltage transition become Hall square wave；
Dutyfactor value module 17 receives pulse-width signal input and calculates its dutycycle；Soft switching module 16 soft switching module
1616, it is connected with hall signal detection module 1313.
Set the nominal torque cycle as 34ms, time when real-time torque cycle is less than the nominal torque cycle less than 34ms, number
The Hall square wave exporting hall signal detection module 13 is trimmed by weighted-voltage D/A converter, to increase soft switching time, and obtains
The soft switching time of 25%；When real-time torque cycle is equal to or more than 34ms, digital to analog converter stops detecting hall signal
What the Hall square wave of module 13 output was carried out trims, and wherein, the soft switching time of the raising and lowering of Hall square wave is fixed as
2.6ms, centre may have longer without driving time.
3) the constant rotational speed method of brshless DC motor 3
For completing the motor after starting, pulsewidth modulation detection module 14 is by soft-start module 15, according to target duty
Than to output module 18 output pulse width modulated signal, output module 18 controls H bridge output driving circuit according to pulse-width signal
The time being switched on or off of each metal-oxide-semiconductor in 31, with the virtual value of electric current in control entrance brshless DC motor 3；
Being set with rotating speed of target in output module 18, the result of calculation of dutycycle is sent to soft opening by dutyfactor value module 17
Dynamic model block 15；Output module 18 obtains the real-time rotating speed of motor by calculating dutycycle, and is entered with real-time rotating speed by rotating speed of target
Row comparison；
When rotating speed of target is more than real-time rotating speed, output module 18, by improving the dutycycle of pulse-width signal, improves
The virtual value of electric current in entrance brshless DC motor 3, to improve the real-time rotating speed of brshless DC motor 3；When rotating speed of target is less than
In real time during rotating speed, output module 18, by reducing the dutycycle of pulse-width signal, is lowered into electric current in brshless DC motor 3
Virtual value, to reduce the real-time rotating speed of brshless DC motor 3.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (9)
1. a control circuit, is connected with the H bridge output driving circuit of brshless DC motor, is used for controlling described brushless dc
The rotating speed of machine or torque, it is characterised in that described control circuit includes processing unit and signal element, described processing unit and institute
Stating signal element to connect, described processing unit is also connected with described H bridge output driving circuit, be used for controlling entering described brushless directly
The virtual value of electric current or the sense of current in stream motor；
Described signal element includes Hall element, Hall amplifier, selector and analog-digital converter, and described processing unit includes defeated
Enter signal detection module, hysteresis comparator, hall signal detection module and output module；Described Hall element is used for exporting Hall
Signal, described Hall element is connected with the input of described Hall amplifier, the outfan of described Hall amplifier and described choosing
The input selecting device connects, and the outfan of described selector is connected with the input of described analog-digital converter, described analog digital conversion
The outfan of device is connected with the input of described input signal detection module, the outfan of described input signal detection module and institute
The input stating hysteresis comparator connects, the outfan of described hysteresis comparator and the input of described hall signal detection module
Connect；Described output module is connected with described H bridge output driving circuit；
Described hall signal forms Hall digital signal, described Hall digital signal through described Hall amplifier and analog-digital converter
Through described input signal detection module enter described hysteresis comparator, described hysteresis comparator according to described Hall digital signal to
Described hall signal detection module output positive voltage or negative voltage.
A kind of control circuit the most according to claim 1, it is characterised in that described signal element includes pulse-width signal
End, minimum speed set end and buffer；Described pulse-width signal end is used for receiving pulse-width signal, described minimum speed
Set end to be used for receiving minimum speed setting signal；Described buffer is connected with described pulse-width signal end, is used for receiving institute
State pulse-width signal and be sent to described processing unit；Described minimum speed sets end and is connected with described selector input,
Described minimum speed sets signal and enters described analog-digital converter through described selector, and described minimum speed sets signal conversion
Becoming minimum speed digital signal, described minimum speed digital signal is sent to described input signal detection by described analog-digital converter
Module.
A kind of control circuit the most according to claim 2, it is characterised in that described processing unit also includes that pulsewidth modulation is examined
Surveying module and soft-start module, described pulsewidth modulation detection module is connected with described buffer, is used for receiving described pulsewidth modulation
Signal；Described soft-start module respectively with described input signal detection module and being connected, be used for receiving described pulse-width signal
With minimum speed digital signal, and described pulse-width signal and minimum speed digital signal are compared, select described arteries and veins
The signal that in wide modulated signal and minimum speed digital signal, dutycycle is bigger is as target duty ratio；Described soft-start module is also
It is connected with described H bridge output driving circuit by described output module, with electric current in the control described brshless DC motor of entrance
Virtual value.
A kind of control circuit the most according to claim 2, it is characterised in that described soft-start module steps up described arteries and veins
The dutycycle of wide modulated signal, until the dutycycle of described pulse-width signal is consistent with described target duty ratio；Described output
Module controls the time being switched on or off of each metal-oxide-semiconductor in described H bridge output driving circuit according to described pulse-width signal, with
The virtual value of electric current in the control described brshless DC motor of entrance.
A kind of control circuit the most according to claim 4, it is characterised in that state processing unit and also include dutyfactor value mould
Block, described output module is set with rotating speed of target and is connected with described input signal detection module；Described dutyfactor value module will
The result of calculation of the dutycycle of pulse-width signal delivers to described output module by described soft-start module；Described output module
Result of calculation according to described pulse-width signal dutycycle obtains the rotating speed of target of described motor, described output module always according to
The real-time rotating speed of motor described in described Hall digital signal acquisition, and described rotating speed of target is compared with described real-time rotating speed
Right；
When described rotating speed of target is more than described real-time rotating speed, described output module is by improving accounting for of described pulse-width signal
Empty ratio, the virtual value of electric current in the raising described brshless DC motor of entrance, to improve the real-time rotating speed of described brshless DC motor；
When described rotating speed of target is less than described real-time rotating speed, described output module is by reducing the duty of described pulse-width signal
Ratio, is lowered into the virtual value of electric current in described brshless DC motor, to reduce the real-time rotating speed of described brshless DC motor.
A kind of control circuit the most according to claim 2, it is characterised in that described hysteresis comparator is provided with hysteresis
With lower hysteresis, described hysteresis comparator by the described Hall digital signal that receives respectively with described upper hysteresis and lower sluggishness
Value comparison；
When described Hall digital signal is more than described upper hysteresis, described hysteresis comparator is to described hall signal detection module
Output positive voltage, when described Hall digital signal is less than described lower hysteresis, described hysteresis comparator is examined to described hall signal
Survey module output negative voltage.
A kind of control circuit the most according to claim 5, it is characterised in that described processing unit also includes soft handover mould
Block, described hall signal detection module is connected with described soft switching module and Hall amplifier respectively, and described hall signal detects
The nominal torque cycle it is set with in module；Described positive voltage or negative voltage transition that described hall signal detection module receives become
Hall square wave, and the real-time torque cycle of described brshless DC motor is calculated according to described Hall square wave；
When described real-time torque cycle is less than the described nominal torque cycle, described hall signal detection module trims described Hall
Square wave also exports, to increase soft switching time；When described real-time torque cycle is equal to or more than the described nominal torque cycle, institute
State hall signal detection module to stop trimming described Hall square wave and exporting.
A kind of control circuit the most according to claim 7, it is characterised in that described hall signal detection module passes sequentially through
Described soft switching module and output module export described Hall square wave to described H bridge output driving circuit, for according to described suddenly
In your the square wave described H bridge output driving circuit of control, each metal-oxide-semiconductor is switched on or off, to control to enter described brshless DC motor
The sense of current of interior electric current.
A kind of control circuit the most according to claim 2, it is characterised in that the input of described selector includes that first is defeated
Enter end and the second input, described first input end is connected with the outfan of described Hall amplifier, described second input and
Described minimum speed sets end and connects；Described minimum speed set end minimum speed is set signal successively through described selector,
Described analog-to-digital conversion module, described input signal detection module and described hysteresis comparator, be sent to the detection of described hall signal
Module.
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| CN111342713A (en) * | 2020-03-03 | 2020-06-26 | 浙江大学 | Control method for bidirectional starting of single-phase brushless direct current motor |
| CN113179051A (en) * | 2021-04-28 | 2021-07-27 | 一巨自动化装备（上海）有限公司 | Soft switching control method for parking actuator |
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| CN117318543A (en) * | 2023-11-28 | 2023-12-29 | 晶艺半导体有限公司 | Starting circuit, driving device and method of direct current brushless motor |
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| CN113179051A (en) * | 2021-04-28 | 2021-07-27 | 一巨自动化装备（上海）有限公司 | Soft switching control method for parking actuator |
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| CN117318543A (en) * | 2023-11-28 | 2023-12-29 | 晶艺半导体有限公司 | Starting circuit, driving device and method of direct current brushless motor |
| CN117318543B (en) * | 2023-11-28 | 2024-04-02 | 晶艺半导体有限公司 | Starting circuit, driving device and method of direct current brushless motor |
| CN117792155A (en) * | 2024-02-23 | 2024-03-29 | 晶艺半导体有限公司 | Soft commutation control circuit and method for motor drive and motor drive system |
| CN117792155B (en) * | 2024-02-23 | 2024-06-07 | 晶艺半导体有限公司 | Soft commutation control circuit and method for motor drive and motor drive system |
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